195/50R18 tire size in inches
A 195/50R18 tire measures
25.7" tall × 7.7" wide
3.84" sidewall on a 18" wheel. 785 revolutions per mile.
195/50R18 means a tire 195 mm wide, with sidewalls 50% as tall as the tire is wide (98 mm), radial construction (R), for a 18 inch wheel.
195/50R18 specs
| Overall diameter (height) | 25.68 inches (652 mm) |
|---|---|
| Section width | 7.68 inches (195 mm) |
| Sidewall height | 3.84 inches (98 mm) |
| Wheel (rim) diameter | 18 inches |
| Circumference | 80.7 inches (2,049 mm) |
| Revolutions per mile | 785 |
| Revolutions per kilometer | 488 |
| Approximate rim width | 5.5" to 7.0" |
| In inches (flotation style) | 25.7x7.7R18 |
| Aspect ratio | 50% |
Calculated from the size. Real tires differ by brand, model and tread depth, typically by a few tenths of an inch.
Sizes that can replace 195/50R18 on a 18" wheel
These 18" sizes are within 3% of 195/50R18's overall diameter, the range most tire shops treat as interchangeable.
| Size | Diameter | Width | Difference | Real speed at 60 | |
|---|---|---|---|---|---|
| 245/40R18 | 25.72" | 9.65" | +0.2% | 60.1 mph | Compare |
| 215/45R18 | 25.62" | 8.46" | −0.2% | 59.9 mph | Compare |
| 275/35R18 | 25.58" | 10.83" | −0.4% | 59.8 mph | Compare |
| 285/35R18 | 25.85" | 11.22" | +0.7% | 60.4 mph | Compare |
| 235/40R18 | 25.40" | 9.25" | −1.1% | 59.4 mph | Compare |
| 225/45R18 | 25.97" | 8.86" | +1.1% | 60.7 mph | Compare |
| 255/40R18 | 26.03" | 10.04" | +1.4% | 60.8 mph | Compare |
| 265/35R18 | 25.30" | 10.43" | −1.5% | 59.1 mph | Compare |
| 205/50R18 | 26.07" | 8.07" | +1.5% | 60.9 mph | Compare |
| 205/45R18 | 25.26" | 8.07" | −1.6% | 59.0 mph | Compare |
| 295/35R18 | 26.13" | 11.61" | +1.8% | 61.1 mph | Compare |
| 225/40R18 | 25.09" | 8.86" | −2.3% | 58.6 mph | Compare |
Same height on other wheel sizes (plus and minus sizing)
| Size | Wheel | Diameter | Difference | |
|---|---|---|---|---|
| 245/45R17 | 17" | 25.68" | 0.0% | Compare |
| 315/35R17 | 17" | 25.68" | 0.0% | Compare |
| 205/60R16 | 16" | 25.69" | 0.0% | Compare |
| 275/40R17 | 17" | 25.66" | −0.1% | Compare |
| 215/75R13 | 13" | 25.70" | +0.1% | Compare |
| 185/80R14 | 14" | 25.65" | −0.1% | Compare |
| 175/70R16 | 16" | 25.65" | −0.1% | Compare |
| 245/50R16 | 16" | 25.65" | −0.1% | Compare |
| 175/85R14 | 14" | 25.71" | +0.1% | Compare |
| 225/60R15 | 15" | 25.63" | −0.2% | Compare |
| 235/25R21 | 21" | 25.63" | −0.2% | Compare |
| 285/30R19 | 19" | 25.73" | +0.2% | Compare |
One size up or down
- 205/50R18wider: 26.1" × 8.1"
- 195/45R18lower profile: 24.9" × 7.7"
- 195/55R18taller sidewall: 26.4" × 7.7"
Compare 195/50R18 with another size
Questions
- How tall is a 195/50R18 tire?
- A 195/50R18 tire is 25.7 inches tall (652 mm), calculated from the size. It is 7.7 inches wide with 3.8 inches sidewalls. Real tires vary by a few tenths of an inch between brands and tread patterns.
- What does 195/50R18 mean?
- 195/50R18 means a tire 195 mm wide, with sidewalls 50% as tall as the tire is wide (98 mm), radial construction (R), for a 18 inch wheel.
- How many revolutions per mile does a 195/50R18 tire make?
- About 785 revolutions per mile, based on a circumference of 80.7 inches. Under load the tire flattens slightly, so the maker's published figure is usually a little higher.
- What rim width fits a 195/50R18 tire?
- Roughly 5.5" to 7.0". Check the tire maker's approved rim range for the exact model before buying wheels.
- Can I use 245/40R18 instead of 195/50R18?
- 245/40R18 is +0.04 inches (+0.2%) in overall diameter, so at an indicated 60 mph you would be doing 60.1 mph. Differences under 3% are usually fine, but check clearance, load index and your vehicle's placard.